package jdbc;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class JDBCDemo6 {
    public static void main(String[] args) {
        try {
            Connection connection=DBUtil.getConnection();
            Statement statement=connection.createStatement();
            String sql="SELECT COUNT(*) count FROM class c JOIN student s ON c.id=s.class_id WHERE c.name='1年级1班'";
            ResultSet resultSet=statement.executeQuery(sql);
            while (resultSet.next()){
                int count=resultSet.getInt("count");
                System.out.println("人数"+count);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
